Pneumatic railway vehicle brake cylinder assemblies



June 3, 1969 R. H. NILSSON 3,447,425

PNEUMATIC RAILWAY VEHICLE BRAKE CYLINDER ASSEMBLIES Filed Sept. 27, 1966 I N VENTOR BY 41/45 Wa/vi;

ATTOR KEYS United States Patent US. Cl. 92-161 1 Claim ABSTRACT OF THE DISCLOSURE A space saving railway vehicle pneumatic brake cylinder assembly is provided comprising a cylinder head secured to a mounting on the vehicle, and a cylinder body detachably secured to a cylindrical portion of the cylinder head. The assembly is provided with means for locking the cylinder body against both axial and rotational displacement relative to the cylinder head.

This invention relates to railway vehicle pneumatic brake cylinder assemblies.

Usually the brake riggings of railway vehicles are arranged below undercarriage frames, but difiiculties arise because of the restricted spaces available, particularly with modern vehicles with other kinds of equipment to be located below the undercarriages, and the difficulties are further increased if the brake riggings are of the more complicated kinds, for example those including devices for automatically adjusting the braking forces in dependence upon variations of the vehicle loads.

It is a general practice to secure a brake cylinder body directly or by a radially extending flange on the body to a bracket or other mounting element on an undercarriage frame. This makes it difiicult to replace a cylinder by one of a different diameter and may require an unduly large proportion of the space available, especially when using a large diameter cylinder with a flange.

The invention is therefore intended to provide an improved vehicle pneumatic brake cylinder assembly.

According to the invention there is provided a railway vehicle pneumatic brake cylinder assembly comprising a cylinder body and a cylinder head detachably secured together, characterized in that the cylinder head is secured to a mounting on the vehicle and a cylinder body is detachably secured to and carried by said cylinder head. Preferably the cylinder body is fitted on to a cylindrical portion of the cylinder head. In an advantageous construction the cylinder body is locked against axial displacement relative to the cylinder head by a strip of metal or other material accommodated partially in a groove in said cylindrical portion and partially in a groove in the cylinder body, and it is also advantageous if the cylinder body is locked against rotational displacement relative to the cylinder head by a screw-threaded bolt extending through a screw-threaded hole in the cylinder head and bearing against the end surface of the cylinder body. The bolt may also assist in securing the cylinder head to the mounting. The cylinder head may be secured to a frame which constitutes the said mounting and also forms part of another device, for example a device for adjusting the braking forces in dependence upon variations of the vehicle loads.

Conveniently the cylinder body is formed integrally "ice with an end wall at the end remote from the cylinder head.

Two cylinders in accordance with the invention are illustrated by way of example in the accompanying drawing, in which:

FIG. 1 is a diagrammatic side view of a cylinder secured to a device for adjusting the braking forces,

FIG. 2 is a detail view in section on the line II-II in FIG. 1, and FIG. 3 is a corresponding detail view illustrating a modification.

In FIG. 1, there is represented the frame 1 of a known device for automatically adjusting braking forces in dependence upon variations of vehicle loads, it being assumed that the frame 1 is secured below a railway vehicle undercarriage frame (not shown). The frame 1 also constitutes a mounting for a pneumatic brake cylinder comprising a body 2 formed integrally with an end wall (not shown), a compressed air supply pipe 3 being secured to this end wall. Forces from a piston (not shown) in the cylinder body 2 are transmitted through a variable leverage system (not shown) in the said device to two draw bars 4 and 5 for transmission to brake blocks (not shown) in known manner.

As appears from FIG. 2, the cylinder body 2 is fitted on to a cylindrical portion of a cylinder head 6, the latter supporting the body 2 and being secured by bolts 11 (of which only one is shown) to a part 10 of the frame 1. The body 2 is locked against axial displacement relative to the head 6 by a strip 9 of steel or other metal or material accommodated partially in a groove 8 in said cylindrical portion of the head 6 and partially in a groove 7 in the body 2. The strip 9 is of square cross-section and the grooves 7 and 8 are of complementary form, the strip 9 being passed into the grooves through a hole in the body 2 in known manner. The body 2 is locked against rotational displacement relative to the head 6 by a screwthreaded bolt 12 extending through a screw-threaded hole in the head 6 and bearing against the end surface of the body. The bolt 12 is furnished with a spring washer and a locknut, and more than one such bolt may be provided.

FIG. 3 illustrates a modification in which the body 2 and head 6 are of smaller diameter than those shown in FIG. 2, the part 10 being the same in both instances. FIG. 3 shows a bolt 13 which has the same function as the bolt 12 and also assists in securing the head 6 to the part 10. More than one bolt like the bolt 13 may be provided.

I claim:

1. A railway vehicle pneumatic brake cylinder assembly comprising (a) a mounting on a vehicle and a cylinder head secured to said mounting and having a cylindrical portion, and

(b) a cylinder body detachably fitted to and carried by said cylindrical portion, said cylinder body being locked against axial displacement relative to said cylinder head by a strip of metal or other material accommodated partially in a groove in said cylindrical portion and partially in a groove in said cylinder body, said cylinder body being additionally locked against rotational displacement relative to said cylinder head by a screw-threaded bolt extending through a screw-threaded hole in said cylinder head and bearing against the end surface of said cylinder body, said screw-threaded bolt serving also as 3 4 a means for securing said cylinder head to said 2,891,513 6/1959 Fagge 92-161 X mounting. 3,005,669 10/1961 Nunnemacher 92-161 3,335,825 8/ 1967 Mersereav et a1. 188-52 X References Clted MARTIN P. SCHWADRON, Primary Examiner. 4 UNITED STATES PATENTS 5 IRWIN c. COHEN, Assistant Examiner. 8 6,704 3/1907 Stucy 28590 X 2,645,513 7/1953 Sterrett 285305 X 2,890,917 6/1959 Prince. 92-165; 22055; 28590 

